<template>
  <el-container class="home_container">
    <el-header>
      <div>
        <img src="../assets/img03.png" alt="" id="firstImg" />
        <span>电商管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu
          background-color="#000000"
          text-color="#fff"
          active-text-color=" #0000ff"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板曲 -->
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-location"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menulist: [],
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenulist()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  updated () {
    console.log(this.menulist)
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenulist () {
      await setTimeout(() => {
        this.menulist = [
          {
            id: 125,
            authName: '用户管理',
            path: 'users',
            children: [
              { id: 110, authName: '用户列表', path: 'users', children: [] }
            ]
          },
          { id: 103, authName: '权限管理', path: 'rights', children: [] },
          { id: 101, authName: '商品管理', path: 'goods', children: [] },
          { id: 102, authName: '订单管理', path: 'orders', children: [] },
          { id: 104, authName: '数据统计', path: 'reports', children: [] }
        ]
      }, 1000)
    },
    // 点击按钮，切换菜单
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home_container {
  height: 100%;
}
.el-header {
  background-color: blueviolet;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: white;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    #firstImg {
      height: 60px;
      width: 50px;
      border-radius: 50%;
    }
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #000000;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: white;
}
.toggle-button{
  background-color: #000000;
  font-size: 10px;
  line-height: 24px;
  color: white;
  text-align: center;
  latter-spacing: 0.2em;
  cursor: pointer;
}
</style>
